[PATCH] ARM: nommu: avoid mapping vectors page when !CONFIG_MMU
From: Greg Ungerer <hidden>
Date: 2011-01-11 12:33:09
Hi Will, On 11/01/11 22:02, Will Deacon wrote:
When running without an MMU, we do not need to install a mapping for the vectors page. Attempting to do so causes a compile-time error because install_special_mapping is not defined. This patch adds compile-time guards to the vector mapping functions so that we can build nommu configurations once more. Cc: Greg Ungerer<redacted> Signed-off-by: Will Deacon<redacted>
I hit this a couple of days ago too, looks good. Acked-by: Greg Ungerer <redacted> Regards Greg
quoted hunk ↗ jump to hunk
arch/arm/kernel/process.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index e76fcaa..94bbedb 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c@@ -483,6 +483,7 @@ unsigned long arch_randomize_brk(struct mm_struct *mm) return randomize_range(mm->brk, range_end, 0) ? : mm->brk; } +#ifdef CONFIG_MMU /* * The vectors page is always readable from user space for the * atomic helpers and the signal restart code. Let's declare a mapping@@ -503,3 +504,4 @@ const char *arch_vma_name(struct vm_area_struct *vma) { return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL; } +#endif
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